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Effects of progesterone sperm receptor function

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Progesterone is a physiological stimulus of human sperm acrosome reaction. The effects of the steroid, which is present in high levels in the cumulus matrix that surrounds the oocyte, are mediated by an increase of intracellular calcium concentrations, tyrosine phosphorylation of proteins, efflux of chloride and stimulation of activity of phospholipases. These effects are due to activation of a nongenomic pathway. Two different types of receptors for progesterone, distinct from the genomic ones, have been identified on the surface of human spermatozoa.
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Progesterone

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Progesterone - Wikipedia

Progesterone P4 is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle , pregnancy , and embryogenesis of humans and other species. Progesterone has a variety of important functions in the body. It is also a crucial metabolic intermediate in the production of other endogenous steroids , including the sex hormones and the corticosteroids , and plays an important role in brain function as a neurosteroid. In addition to its role as a natural hormone, progesterone is used as a medication , for instance in menopausal hormone therapy ; for information on progesterone as a medication, see the progesterone medication article. It was first described in Progesterone is the most important progestogen in the body.
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Effects of progesterone on sperm function: mechanisms of action.

Sushama Gadkar, C. Expression of progesterone receptor PR localization on spermatozoa was determined in men with normal and abnormal spermiograms. Studies were also carried out to evaluate the potential of PR as a marker of sperm function. This was observed in all study groups i.
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Progesterone stimulates sperm functions, e. The physiological relevance of these effects has been shown using female genital tract fluids which modulate sperm function according to their progesterone content. Progesterone interacts with specific sperm binding sites that, unlike the classic nuclear receptors, are located on the plasma membrane of the spermatozoon.
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